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wasoxygen · 2190 days ago · link · · parent · post: Everything you ever need to know about how the eye sees colors
Puffin beaks are fluorescent Humans see colours that are a mix of red, blue and green light, he notes, while birds have a fourth colour in the mix — a property called tetrachromatic vision.Unlike humans, birds have always known about the extra colours in the puffin bill. That's because they can see a whole other dimension of hues, said Dunning.